Piece of decorticated Fraxinus wood, collected 4 months ago, has produced several asco's including Rhamphoria pyriformis. But other minute, longer-necked black perithecia have turned up recently: hyaline 3-septate spores, thick-walled,fusiform (i.e. ends not rounded), 11-13 x 4-5 mu, 8/ascus, uniseriate, asci95-135 mu including rather long thin stipe thin part 20+ mu). Apical annulus visible as two dots, nonamyloid.

Periphyses septate, diameter 7 mu, apical part 4 mu.
The pycnidia (0.25-0.5 mm) with necks up to 0,7 mm, half to largely immersed in the substratum. Top of neck with light-coloured drops consisting of spores.

My first idea was: Lentomitella, i.e. L. crinigera but this species has a short stipe and ellipsoid striated spores with rounded ends (no stipes shown in drawings and photos of Reblova 2006). Ceratosphaeria is another long-necked pyrenomycete, but these species have even longer spores and/or more septa. Another option would be Rhodoveronaea varioseptata, of which the teleomorph was described by Reblova in 2009. Some characters fit well (spore form, spore wall, thin stipe), but this possibility was rejected because the spores are too small compared with the epitype: 14-16.5 x 6-6.5 mu (the other, Swedish specimen examined by Reblova has even larger spores). Also the necks are at variance with Reblova's description: not tapering to the top and much longer.

What else could it be? All suggestions will be much appreciated.